@dickon @marcan Nothing written after the XRender extension (2000) uses network transparency on X11. It's all client-side buffers sent as images over the wire—something the X11 core protocol is *shockingly* bad at doing, because it interleaves commands and buffers, and that prevents even the simplest form of compression. Even VNC is more efficient.
If you want remoting with Wayland, I strongly encourage you to look at RDP.
@ebassi @dickon @marcan I think that most people don't really care whether there's real network transparency or not, they just want to type "ssh -Y host", launch a GUI application and see it pop up on their screen. It looks like waypipe could provide this kind of experience but I haven't tried it yet so I don't know if it's full of papercuts